contestada

how can one explain the fact that nearly all other galaxies appear to be moving farther away from us?

a) the universe is expanding b) the apparent motion is just an optical illusion

Respuesta :

A) the universe is expanding
Every galaxy is moving away from each other - not just us. And the further they are away, the faster they are moving
How can one explain the fact that nearly all other galaxies appear to be moving farther away from us?


a) the universe is expanding